Node.js开发之套接字(socket)编程入门示例

var net = require("net");
// server is an instance of net.Server
// sock is an instance of net.Socket
var server = net.createServer(function(sock){
 console.log('client connected, address - ', sock.remoteAddress, ' port - ', sock.remotePort);
 sock.setEncoding('utf8');
 sock.on('data', function(data){
  console.log('got data from client - ', data);
  sock.write(data);
 });
 sock.on('end', function(){
  console.log('client disconnected');
 });
 sock.on('error', function(err){
  console.log('socket error - ', err);
 });
});
server.maxConnections = 10;
server.listen(7, function(){
 console.log('echo server bound at port - 7');
});

var net = require("net");
var server = net.createServer();
server.on('connection', function(sock){
 console.log('client connected, address - ', sock.remoteAddress, ' port - ', sock.remotePort);
 sock.setEncoding('utf8');
 sock.on('data', function(data){
  console.log('got data from client - ', data);
  sock.write(data);
 });
 sock.on('end', function(){
  console.log('client disconnected');
 });
 sock.on('error', function(err){
  console.log('socket error - ', err);
 });
});
server.maxConnections = 10;
server.listen(7, function(){
 console.log('echo server bound at port - 7');
});

var net = require("net");
var readline = require('readline');
console.log('type "exit" or "quit" to quit.');
// sock is an instance of net.Socket
var sock = net.connect({port: 7}, function(){
 console.log('server connected');
 sock.setEncoding('utf8');
 sock.write('Hello Echo Server\r\n');
});
sock.on('data', function(data){
 console.log('got data from server - ', data);
});
sock.on('end', function(){
 console.log('client disconnected');
});
sock.on('error', function(err){
 console.log('socket error - ', err);
});
sock.on('close', function(){
 console.log('echo client was closed');
 process.exit(0);
});
var rl = readline.createInterface({
 input: process.stdin
});
function quitEcho(){
 rl.close();
 sock.end();
 console.log('quit echo client');
}
rl.on('line', function(cmd){
 if(cmd.indexOf('quit') == 0 || cmd.indexOf('exit') == 0){
  quitEcho();
 }else{
  sock.write(cmd + '\r\n');
 }
});
rl.on('SIGINT', quitEcho);

net.connect(options[, connectionListener])